Metallurgical and Materials Transactions A

, Volume 42, Issue 6, pp 1657–1666

Mushy Zone Coarsening in an AlCu30 Alloy Accelerated by a Rotating Magnetic Field

Article

DOI: 10.1007/s11661-010-0542-6

Cite this article as:
Kasperovich, G., Genau, A. & Ratke, L. Metall and Mat Trans A (2011) 42: 1657. doi:10.1007/s11661-010-0542-6

Abstract

Annealing experiments were performed on a near-eutectic Al-30 wt pct Cu alloy held in temperature gradients from 0.1 to 3 K/mm for annealing times of 10 to 500 minutes, with and without the application of rotating magnetic fields. After annealing, metallographic analysis was carried out on sections of the samples with a constant fraction solid of 10 pct. X-ray tomography was also used to create three-dimensional (3-D) reconstructions of the microstructures with a spatial resolution of approximately 1 μm. The specific surface area was measured in two dimensions and three dimensions, as well as the local curvature distribution on the 3-D reconstructed images. The microstructures show clearly that fluid flow accelerates coarsening of the mush and that the temperature gradient has a pronounced and unexpected influence on the coarsening kinetics.

Copyright information

© The Minerals, Metals & Materials Society and ASM International 2010

Authors and Affiliations

  1. 1.Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR)KölnGermany